Conditions for Clearing the MIL/DTC
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.
DTC P2144
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) Connector End Views or Engine Controls Connector End Views |
|||
| 1 | Did you perform the Diagnostic System Check-Engine Controls? | Go to Step 2 | Go to Diagnostic System Check - Engine Controls |
| 2 |
|
Go to Step 3 | Go to Step 4 |
| 3 |
|
Go to Step 4 | Go to Intermittent Conditions |
| 4 |
|
Go to Step 5 | Go to Step 6 |
| 5 |
|
Go to Step 12 | Go to Step 7 |
| 6 | Inspect the Fuel HT fuse for an open. Is the fuse open? |
Go to Step 11 | Go to Step 10 |
| 7 | Does the test lamp remain illuminated with each command? | Go to Step 9 | Go to Step 8 |
| 8 | Test the control circuit of the EGR vacuum vent solenoid for an open and for high resistance. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 16 | Go to Step 13 |
| 9 | Test the control circuit of the EGR vacuum vent solenoid for a short to ground. Refer to Testing for Short to Ground
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 16 | Go to Step 12 |
| 10 | Test the ignition 1 voltage circuit for an open or high resistance. Refer to Testing for Short to Ground
and Wiring Repairs
in Wiring Systems. Did you complete the repair? |
Go to Step 16 | - |
| 11 | Test the ignition 1 voltage circuit for a short to ground. Refer to Testing for Short to Ground
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 16 | Go to Step 12 |
| 12 | Test for an intermittent and for a poor connection at the EGR vacuum vent solenoid. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 16 | Go to Step 14 |
| 13 | Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 16 | Go to Step 15 |
| 14 | Replace the EGR vacuum vent solenoid. Refer to Exhaust Gas Recirculation (EGR) Valve Vent Solenoid Replacement
. Did you complete the replacement? |
Go to Step 16 | - |
| 15 | Replace the ECM. Refer to Engine Control Module (ECM) Replacement Did you complete the replacement? |
Go to Step 16 | - |
| 16 |
|
Go to Step 2 | Go to Step 17 |
| 17 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? |
Go to Diagnostic Trouble Code (DTC) List | System OK |